#ifndef ENTITY_H
#define ENTITY_H

#include <vector>

#include <iostream>
#include "opengl.h"

#include "util.h"
#include "oct.h"
#include "view.h"
#include "material.h"

using namespace std;
using namespace gl;

struct geometry
{
  geometry *parent;
  box bbox;

  virtual void update ()
  {
    if (parent)
      parent->update ();
  }

  virtual void draw (view &ctx) = 0;
  geometry (geometry *parent = 0) : parent(parent) { };
  virtual ~geometry ();
};

struct geometry_opengl : geometry
{
  GLuint list; // TODO: dynamic caching

  geometry_opengl ();
  ~geometry_opengl ();
};

template<GLenum type>
struct geometry_opengl1d : geometry_opengl, vector<vertex_v3f>
{
  void set (const vector<vertex_v3f> &v);
  void draw (view &ctx);
};

template<GLenum type>
struct geometry_opengl2d : geometry_opengl
{
  material *m;

  geometry_opengl2d () : m(0) { };

  void set (const vector<vertex_t2f_n3f_v3f> &v);
  void draw (view &ctx);
};

typedef geometry_opengl1d<GL_POINTS>         geometry_points;
typedef geometry_opengl1d<GL_LINES>          geometry_lines;
typedef geometry_opengl1d<GL_LINE_STRIP>     geometry_line_strip;
typedef geometry_opengl1d<GL_LINE_LOOP>      geometry_line_loop;
typedef geometry_opengl2d<GL_TRIANGLES>      geometry_triangles;
typedef geometry_opengl2d<GL_TRIANGLE_STRIP> geometry_triangle_strip;
typedef geometry_opengl2d<GL_TRIANGLE_FAN>   geometry_triangle_fan;
typedef geometry_opengl2d<GL_QUADS>          geometry_quads;
typedef geometry_opengl2d<GL_QUAD_STRIP>     geometry_quad_strip;
typedef geometry_opengl2d<GL_POLYGON>        geometry_polygon;

struct geometry_nurbs : geometry, vector<vertex_t2f_n3f_v3f>
{
  GLUnurbsObj *nurb;
  GLUtesselator *tess;
  GLfloat ctlpoints[4][4][3];

  geometry_nurbs() : tess(0), nurb(0) { }
  virtual void draw (view &ctx);
  void set ();
};

struct geometry_sphere : geometry
{
  material *m;
  GLfloat radius;

  void update ();
  void draw (view &ctx);
  geometry_sphere (material *m, GLfloat radius) : m(m), radius(radius) { update (); };
};

struct geometry_indexed_2d : geometry
{
  material *m;

  GLenum type;

  vertex_buffer vb;
  index_buffer  ib;

  void draw (view &ctx);

  template <typename vertex, typename index> 
  geometry_indexed_2d (material *m, GLenum type, const vector<vertex> &v, const vector<index> &i)
  : m(m)
  {
    vb.set (v);
    //ib.set (i);
    
    //bbox.reset ();
    //for (typename vector<vertex>::const_iterator i = v.begin () ; i != v.end (); ++i)
    //  bbox.add (i->v);
  }

};

/////////////////////////////////////////////////////////////////////////////

struct geometry_filter : geometry
{
protected:
  geometry *g;
public:

  void set (geometry *g);

  geometry *content () { return g; };

  void update ();
  void show ();
  void draw (view &ctx);
  geometry_filter (geometry *g = 0) { set (g); }
  ~geometry_filter ();
};

struct geometry_transform : geometry_filter
{
protected:
  matrix m;
public:
  void update ();

  void show ();
  void draw (view &ctx);
  void set_matrix (const matrix &xfrm);
  void update (const matrix &xfrm);

  geometry_transform (geometry *g) : geometry_filter(g), m(1) { };
  geometry_transform () : geometry_filter(0), m(1) { };
};

struct geometry_anim : geometry_transform
{
  GLfloat vx, vy, vz;
  void draw (view &ctx);
};

struct geometry_container : geometry, protected vector<geometry *>
{
  void update ();

  void add (geometry *g);
  void draw (view &ctx);
  ~geometry_container ();
};

/////////////////////////////////////////////////////////////////////////////

struct entity : geometry_filter
{
  sector orig;
  point p;
  sector a, b; // bounding box corners

  vector<octant *> o;

  void update ();
  void draw (view &ctx);

  void move (const vec3 &v);

  virtual void show ();
  virtual void hide ();

  entity (geometry *g = 0);
  ~entity ();
};

struct entity_light : entity
{
  light *lview;
};

/////////////////////////////////////////////////////////////////////////////
//
// VERY EXPERIMENTAL HEIGHTMAP

struct geometry_heightfield : geometry
{
  struct node;

  node *tree;

  GLfloat sx, sy, sm;

  void update ();
  void draw (view &ctx);
  geometry_heightfield (GLfloat sx, GLfloat sy);
};

#endif